i think the ecu is having problems, so i have a ecu out of 87na gxl should there be a problem switching them? i herd that the numbers have to match. on these two it is 1 number of on the big number located on the out side of the box. what numbers should i be looking to match? or does it matter?

 

327 or 326 as long as the date is an S4 manufactured date then the ECU will correspond.

 

it is 326 and 327. the date is prob. on the front by the numbers right? how do you know if its an s4 date?

 

how do you know what date? call mazda with the vin number???

 

date doesnt matter. n326 or 327 will work fine.

 

THANKS